https://youtu.be/rjdT-H513z4It is alive. Although there seem to be some skewing of the z axis. I'm not sure if it is rounding/overflow errors in the firmware or I'm losing steps, our if I have a pulley slipping.

I printed a one cm cube which came out noticeably skewed and about one mm to short. I thought it appeared that it was leaning towards one arm so I made a six pointed star and printed that. Long before the print finished it was obvious which arm is different. It looks to me like arm number one is somehow shorter than the other two arms. Now I need to figure out what to do about it.

I'm glad to hear it kind of worked for you. I just wish I saw this less than two years later so my response would have been more helpful. lines 363-368 in configuration.h set the max length for each armlines 833 and 834 can be used to adjust your steps per unit.